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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc46e4bfea49ed4c0bb3ea37001dcaa073037ec6d4c36ee0e5cb88d6d71e7c0e' 
  AND token = 'iD5cVCT1ignPClpLI2+iYtRxF/h8aqCTypvPewjfHTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}